<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    
</body>
</html>
<script>
    var obj = { name:'李煜',age:30,sex:true,hobby:['打球','听音乐'] };
    function copyObj(obj){
        var obj2 = Array.isArray(obj)?[]:{};
        for (var key in obj){
            // 判断key属性的值是否引用类型， 如果是,
            //  则需要继续循环遍历处理该属性的值( 递归处理该属性的值 )
            if (typeof obj[key] =="object"){
                obj2[key] = copyObj(obj[key])
            }else{
                obj2[key] = obj[key]
            }
        }
        return obj2
    }
        var obj2 = copyObj( obj );
        console.log( obj ); 
        console.log(obj2);  
</script>